import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class CardDemo {

    public static final String[] suits = {"♠", "♥", "♣", "♦"};

    public List<Card> buyCard(){
         List<Card> cardList = new ArrayList<>();
         for (int i = 1; i <= 13; i++){
             for(int j = 0; j< 4; j++){
             int rank = i;
             String suit = suits[j];
             Card card = new Card(suit,rank);
             cardList.add(card);
             }
         }
         return cardList;
    }

    private static void swap(List<Card> cardList, int i, int j) {
        Card t = cardList.get(i);
        cardList.set(i, cardList.get(j));
        cardList.set(j, t);
    }
    public static void shuffle(List<Card> cardList) {
        Random random = new Random();
        for (int i = cardList.size() - 1; i > 0; i--) {
            int index = random.nextInt(i);
            swap(cardList, i, index);
        }
    }


    public List<List<Card>> play(List<Card> cardList) {
        List<Card> hand0 = new ArrayList<>();
        List<Card> hand1 = new ArrayList<>();
        List<Card> hand2 = new ArrayList<>();

        List<List<Card>> hand = new ArrayList<>();
        hand.add(hand0);
        hand.add(hand1);
        hand.add(hand2);

        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 3; j++) {
                Card card = cardList.remove(0);
                //怎么把对应的牌 放到对应的人的手里面
                hand.get(j).add(card);
            }
        }
        return hand;
    }
}
